Mesaa tt800 issue?

[Gordo350]

Just recently bought a s/h tt800 to replace the d800+ that I stupidly sold and I'm wondering if it has a problem.
I play thru two ashdown 410s and find i have to almost crank the bass knob. I have the deep switch on and the highpass at about 10 o'clock.
It just doesn't have that boom i remember the d800 having.
Could there be an issue? I have attached a picture of my settings

 

[agedhorse]

Try each cabinet individually and see if that improves the low end. You will get this symptom if one of your cabinets or one of your cables is wired with reverse polarity, when using two cabinets together.

What you are hearing isn't normal.

Also, if your 410's are 4 ohms cabinets, double-check that you have the impedance switch on your amp set to the 2 ohm position.

 

[Gordo350]

Yes, have tried cabs individually, same results just less volume.
Cabs are 8 ohm and I have the impedance set at 4 ohms

 

[agedhorse]

Yes, have tried cabs individually, same results just less volume.
Cabs are 8 ohm and I have the impedance set at 4 ohms

Ok, I have no idea why, can't even think of a reason the amp would cause this.

 

[Gordo350]

I will try a different cab when I can get a hold of one off a friend.
If the valves were changed or faulty would this cause any issue?

 

[agedhorse]

I will try a different cab when I can get a hold of one off a friend.
If the valves were changed or faulty would this cause any issue?

Yes, they must be 12AT7. If somebody put 12AX7's in there, it won't sound good at all. It even written on the PCB by the tubes to use a 12AT7 or 12AU, ,the 12AX7 can't drive the following stage and won't bias up correctly. I thought you bought it new?

 

[Gordo350]

No , second hand but I did just take a look at the valves. Definitely mesa 12at7s installed.
I wish I could afford to get a good subway speaker to match it but at $3500 for a 212 here in Australia it just ain't happening

 

[MattyE27888]

Why don’t you just try a new tube?

 

[Gordo350]

I'm not that confident with high voltage and they are $60 ea x 3.
I'd rather not waste money on something it might not be

 

[ShadowGroover]

If someone purchases a "broken amp," how do they proceed? (Blame the manufacturer is not in the effective answer menu)

 

[eniac]

Between the time you sold the first amp and bought the current one, were those cabs used by anyone (including you)?

With an instrument (or patch) cable, try connecting the FX send jack to the FX return jack of the channel you're plugged into.

Hopefully you bought that amp with return privileges.

 

[Gordo350]

I'll try that too. The cabs have been my goto for a couple of years now. Maybe they are getting tired. I will change out the speaker cables and also check they are wired the same.
The amp is mine now so I'll have to deal with it.
If all else fails I'll get intouch with a mesa repair dealer to have it looked at. They are a bit scarce here but they are around.

 

[BaltBass5]

@agedhorse is the authority on this but I noticed in your pic you have the D800 channel selected. Do you get the same results with both channels?

 

[SpiderBass1965]

@agedhorse is the man for this but I will mention your High Bypass settings. Try them in the lowest position, fully counter-clockwise. You might have dialed out the low end you used to hear from your D800+.

 

[oldcatfish]

If you haven’t already, try the amp with a different cab….just to make sure something is actually happening with the amp.

 

[ole Jason]

1. Turn off the HPF, it should be fully counter-clockwise when troubleshooting this
2. If your bass has an active EQ make sure it doesn't have the bass cut

 

[Nebadon2000]

@agedhorse is the man for this but I will mention your High Bypass settings. Try them in the lowest position, fully counter-clockwise. You might have dialed out the low end you used to hear from your D800+.

If you meant HPF setting it is well within reason but based on settings in photo with Bass controls cranked, mid's cut and deep switch on it should sound super bassy[boomy]

With Boogie channel Tone Stack is passive here are what manual calls 'Flat' for Boogie channel using Clock type position;

Boogie Channel: Subway Channel: Bass/Mid/Treble: Interactive legacy Mesa Boogie tonestack “flat” is approx: Bass = 8:30, Middle = 5:00, Treble = 8:00 (classic position) “flat” is approx: Bass = 10:30, Middle = 5:00, Treble = 9:30 (shift position)

MID CONTROL: This control is responsible for the amount (or volume) of midrange present in the signal, relative to bass and treble. There is an inherent mid dip present (in this design around 500Hz), which is characteristic of this style of tone stack eq, so for a stronger, flatter response you will find this control set between the 1:00 and 4:00 positions will get you there. The midrange is responsible for the articulation and perception of pitch, especially in the lowest octave of the instrument, because of how the harmonic spectrum is distributed in the output of a bass guitar’s signal.

 

[SpiderBass1965]

If you meant HPF setting it is well within reason but based on settings in photo with Bass controls cranked, mid's cut and deep switch on it should sound super bassy[boomy]

With Boogie channel Tone Stack is passive here are what manual calls 'Flat' for Boogie channel using Clock type position;

Boogie Channel: Subway Channel: Bass/Mid/Treble: Interactive legacy Mesa Boogie tonestack “flat” is approx: Bass = 8:30, Middle = 5:00, Treble = 8:00 (classic position) “flat” is approx: Bass = 10:30, Middle = 5:00, Treble = 9:30 (shift position)

MID CONTROL: This control is responsible for the amount (or volume) of midrange present in the signal, relative to bass and treble. There is an inherent mid dip present (in this design around 500Hz), which is characteristic of this style of tone stack eq, so for a stronger, flatter response you will find this control set between the 1:00 and 4:00 positions will get you there. The midrange is responsible for the articulation and perception of pitch, especially in the lowest octave of the instrument, because of how the harmonic spectrum is distributed in the output of a bass guitar’s signal.

Yes, I meant the HPF. I own a TT-800 and have read the manual. I was just offering another contributor too his lack of bottom end. You can crank the bass, and the bass boost all you want but if you have the HPF on, you are removing bottom end.

 

[MCS4]

I don't have a good solution for you, but it does sound like something bigger is likely going on rather than just finding the right amp settings. With my Mesa Subway DI preamp into a power amp running two 4x10s those settings would be an incredible amount of low end. If I have the "Deep" switch in I generally am not going above halfway on the bass knob.

My only thought other than those already suggested is whether you previously might have used the higher gain setting whereas lower gain is currently selected. I doubt that would be the difference given the problems suggested but it's one more thing to confirm.

 

[rickdog]

I'm not that confident with high voltage and they are $60 ea x 3.

Yikes! A 12AT7 is $60 in Australia?!?

For testing, you'd only need one (try it in each location in turn to see if it makes a difference).

Perhaps you have a guitar-playing buddy who has a spare you can borrow for testing?